Potential answers for "Oil-producing matter in shale"

⭐⭐⭐⭐ KEROGEN
⭐⭐⭐ KEROSENE
⭐⭐⭐ OLIVE
⭐⭐⭐ OPEC
⭐⭐⭐ SHALE
⭐⭐⭐ SYNFUEL
⭐⭐⭐ PALM
⭐⭐⭐ OLIVEGROVE

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